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How to change CJK font?

I like it how Firefox ships with Open Sans, but I don't like the rounded look of CJK characters – I prefer the standard CJK font of Android 4.x. How can I change Firefox into using those fonts instead?

I like it how Firefox ships with Open Sans, but I don't like the rounded look of CJK characters – I prefer the standard CJK font of Android 4.x. How can I change Firefox into using those fonts instead?

Lynguist,
You can change the fonts used in content to your own choosing albeit only through advanced about:config preferences. This is not recommended.
Change these in about:config;
*font.name.serif.x-user-def
*font.name.sans-serif.x-user-def
*font.name.sans-serif.x-user-def
*font.name.monospace.x-user-def
*font.name-list.sans-serif.x-user-def
*font.name-list.sans-serif.x-user-def
*font.name.serif.x-western
*font.name.sans-serif.x-western
*font.name.sans-serif.x-western
*font.name.monospace.x-western
*font.name-list.sans-serif.x-western
*font.name-list.sans-serif.x-western
I've never tried changing these so you are at your own risk here.